Credit: The Associated Press

DONETSK, Ukraine — Discouraged but defiant, pro-Russia separatists vowed to keep fighting the government in Kiev from the largest city in eastern Ukraine, where they regrouped Sunday after being driven out of a key stronghold.

At a rally in a central Donetsk square, the rebels were cheered on by thousands of supporters waving flags from Russia and the self-proclaimed independent Donetsk People's Republic. Many urged Russian President Vladimir Putin to quickly come to their aid — but there was no comment Sunday from Russia.